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首页> 外文期刊>TAO: Terrastrial, atmospheric, and oceanic sciences >Crustal Velocity Structures Imaged from Four-Component OBS Data Across the Southern Gagua Ridge in the Western Philippine Sea
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Crustal Velocity Structures Imaged from Four-Component OBS Data Across the Southern Gagua Ridge in the Western Philippine Sea

机译：从横跨菲律宾西部加瓜海岭南部的四组分OBS数据成像的地壳速度结构

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摘要

Crustal structures near a linear oceanic ridge, the Gagua Ridge, between the West Philippine Basin and the Huatung Basin in the western Philippine Sea were imaged based on head-wave, refracted and reflected P-wave arrivals recorded from 24 ocean-bottom seismometers (OBS). Velocity anomaly zones, one below the Gagua Ridge summit and the others beneath two toes of the Gagua Ridge, imaged by large lateral variations in P-wave velocity of 5.5 - 6.4 km s(-1) and low velocity of 4 - 5 km s(-1) in the upper crust may have been generated when the Gagua Ridge was formed. East of the ridge, velocity anomaly zones, constrained by large lateral variations in P-wave velocity (4.8 - 6.4 km s(-1)), relatively low velocity (4 - 5 km s(-1)) and laterally high anomaly of Poisson's ratio (0.02 - 0.04) in the upper crust and abrupt crustal thickening (6 - 8.5 km) northward were obtained. West of the ridge, the velocity anomaly zones indicated by large lateral variations in P-wave velocity (5.2 - 6.2 km s(-1)) and laterally high anomaly of Poisson's ratio (0.02 - 0.04) in the upper crust and thick crust (thickening southward from 9 - 12 km) were found below the Huatung Basin and the Western Trough of the Gagua Ridge. Abrupt crustal thickening northward east of the ridge may be related to northwestward convergence of the Philippine Sea Plate. These velocity anomaly zones in the upper crust at both sides of the ridge might result from deformed, fractured or faulted zones. These zones support E - W compression, N - S shearing (or transpression) and uplifting that may have also created the Gagua Ridge and crustal thickening west of the ridge.
机译：基于24个海底地震仪（OBS）记录的头波，折射和反射的P波到达，对位于西菲律宾海和西菲律宾海之间的线性海洋脊加瓜脊附近的地壳结构进行了成像）。速度异常区，一个在加瓜岭山顶以下，另一个在加瓜岭两个脚趾下，由P波速度5.5-6.4 km s（-1）的较大横向变化和4-5 km s的低速变化成像加瓜岭形成时可能是在上地壳中产生了（-1）。在山脊以东，速度异常区，受到P波速度（4.8-6.4 km s（-1））的较大横向变化，相对较低的速度（4-5 km s（-1））和横向偏高的约束获得了上地壳的泊松比（0.02-0.04）和向北的突然地壳增厚（6-8.5 km）。在山脊以西，速度异常带由P波速度的大的横向变化（5.2-6.2 km s（-1））和上地壳和厚地壳的泊松比的横向高异常（0.02-0.04）表示（在华东盆地和高瓜岭西部海槽以下发现了从9-12 km向南增厚的地层。洋脊以北突然的地壳增厚可能与菲律宾海床的西北向汇聚有关。脊两侧上地壳中的这些速度异常区可能是由变形，断裂或断层带引起的。这些区域支持E-W压缩，N-S剪切（或反压）和隆升，这也可能造成了Gagua脊和该脊以西的地壳增厚。

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